Hi Jack & others,
I did download & install the RA8875, Open Audio, and some other libraries.? However I missed the part about them needing to be in the Teensy library which is why they were out of place. Concerned about conflicts I decided to wipe out everything and re-install the IDE and Teensy add on.? Then I added any missing libraries listed in the instructions into the Teensy library folder.
After that the next compile took significantly longer to complete.? However I still had some complaints from the compiler.?
I noticed that some of the complaints were referencing library files stored in: c:/users/admininstrator/my documents/arduino. ? I believe this folder was from my first IDE & Teensy installation before doing the install into the c:/arduino1.8.7 folder as advised. ? So I deleted the c:/users/admininstrator/my documents/arduino folder, ran a compile, and the compile finished with no errors.
I figured I'd mention this in case anyone else had issues from previous IDE installs.
Jim KM4TXR